be made of与be made from的区别

问题描述:

be made of与be made from的区别

都是表示 由什么组成
be made of 是可以看出原材料的,例:The sweater was made of woollen.
毛衣是羊毛作的(可以看出的)
be made from是不可以看出原材料的,例/:The paper is made from wood
纸是树木作的(看不出来的)